[Bug 20225] don't allow overridden operations and attribute getters/setters to be invoked on descendant objects

https://www.w3.org/Bugs/Public/show_bug.cgi?id=20225

--- Comment #2 from Cameron McCormack <cam@mcc.id.au> ---
Oh, I don't think it's the intention to look at properties at run time -- just
what IDL operations/attributes are declared on interfaces.  So
HTMLCollection.prototype.namedItem would always first just check if `this` is
an HTMLPropertiesCollection, and throw if so.  Whether there is a property
called namedItem somewhere else on the prototype chain at run time shouldn't
matter.

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